diff options
| author | Brendan Jackman <jackmanb@google.com> | 2025-03-11 16:18:17 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-03-17 08:06:38 +0300 |
| commit | bf6d575e24ee91f7ba8a752c0354bb00db1d3bf2 (patch) | |
| tree | 1b2191d2986c8be48d8bdd7e9ad3434a27fe06c0 /tools/testing | |
| parent | db0f1c138f18296e9c1c91619a0517c05ee50f1b (diff) | |
| download | linux-bf6d575e24ee91f7ba8a752c0354bb00db1d3bf2.tar.xz | |
selftests/mm: don't fail uffd-stress if too many CPUs
This calculation divides a fixed parameter by an environment-dependent
parameter i.e. the number of CPUs.
The simple way to avoid machine-specific failures here is to just put a
cap on the max value of the latter.
Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-6-dec210a658f5@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Suggested-by: Mateusz Guzik <mjguzik@gmail.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/mm/uffd-stress.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c index 4ba5bf13a010..40af7f67c407 100644 --- a/tools/testing/selftests/mm/uffd-stress.c +++ b/tools/testing/selftests/mm/uffd-stress.c @@ -435,6 +435,7 @@ static void sigalrm(int sig) int main(int argc, char **argv) { + unsigned long nr_cpus; size_t bytes; if (argc < 4) @@ -453,7 +454,15 @@ int main(int argc, char **argv) return KSFT_SKIP; } - nr_parallel = sysconf(_SC_NPROCESSORS_ONLN); + nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); + if (nr_cpus > 32) { + /* Don't let calculation below go to zero. */ + ksft_print_msg("_SC_NPROCESSORS_ONLN (%lu) too large, capping nr_threads to 32\n", + nr_cpus); + nr_parallel = 32; + } else { + nr_parallel = nr_cpus; + } nr_pages_per_cpu = bytes / page_size / nr_parallel; if (!nr_pages_per_cpu) { |